If you have the video connected via scart check that you have the correct connection from the back of the video to your tv.
Checking the instruction manual from the JVC web site L1 goes to the TV. L2 would connect to Sat box.
To record from sat box record from L2 channel.
Looking through the instructions you Video recorder has Auto and manual chanel setup. You can change channel setting manualy at any time following the instructions.